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4e92af9f43
Bug#24509 - 2048 file descriptor limit on windows needs increasing, also
WL#3049 - improved Windows I/O
The patch replaces the use of the POSIX I/O interfaces in mysys on Windows with
the Win32 API calls (CreateFile, WriteFile, etc). The Windows HANDLE for the open
file is stored in the my_file_info struct, along with a flag for append mode
because the Windows API does not support opening files in append mode in all cases)
The default max open files has been increased to 16384 and can be increased further
by setting --max-open-files=<value> during the server start.
Another major change in this patch that almost all Windows specific file IO code
has been moved to a new file my_winfile.c, greatly reducing the amount of code
in #ifdef blocks within mysys, thus improving readability.
Minor enhancements:
- my_(f)stat() is changed to use __stati64 structure with 64 file size
and timestamps. It will return correct file size now (C runtime implementation
used to report outdated information)
- my_lock on Windows is prepared to handle additional timeout parameter
- after review : changed __WIN__ to _WIN32 in the new and changed code.
68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include <my_global.h>
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#include <my_sys.h>
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#ifdef USE_SYSTEM_WRAPPERS
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#include "system_wrappers.h"
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#endif
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#ifdef HAVE_GETRUSAGE
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#include <sys/resource.h>
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#endif
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#ifdef THREAD
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#include <my_pthread.h>
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extern pthread_mutex_t THR_LOCK_malloc, THR_LOCK_open, THR_LOCK_keycache;
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extern pthread_mutex_t THR_LOCK_lock, THR_LOCK_isam, THR_LOCK_net;
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extern pthread_mutex_t THR_LOCK_charset, THR_LOCK_time;
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#else
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#include <my_no_pthread.h>
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#endif
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/*
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EDQUOT is used only in 3 C files only in mysys/. If it does not exist on
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system, we set it to some value which can never happen.
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*/
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#ifndef EDQUOT
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#define EDQUOT (-1)
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#endif
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void my_error_unregister_all(void);
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#ifdef _WIN32
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/* my_winfile.c exports, should not be used outside mysys */
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extern File my_win_open(const char *path, int oflag);
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extern int my_win_close(File fd);
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extern size_t my_win_read(File fd, uchar *buffer, size_t count);
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extern size_t my_win_write(File fd, const uchar *buffer, size_t count);
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extern size_t my_win_pread(File fd, uchar *buffer, size_t count,
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my_off_t offset);
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extern size_t my_win_pwrite(File fd, const uchar *buffer, size_t count,
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my_off_t offset);
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extern my_off_t my_win_lseek(File fd, my_off_t pos, int whence);
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extern int my_win_chsize(File fd, my_off_t newlength);
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extern FILE* my_win_fopen(const char *filename, const char *type);
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extern File my_win_fclose(FILE *file);
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extern File my_win_fileno(FILE *file);
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extern FILE* my_win_fdopen(File Filedes, const char *type);
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extern int my_win_stat(const char *path, struct _stat64 *buf);
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extern int my_win_fstat(File fd, struct _stat64 *buf);
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extern int my_win_fsync(File fd);
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extern File my_win_dup(File fd);
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extern File my_win_sopen(const char *path, int oflag, int shflag, int perm);
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extern File my_open_osfhandle(HANDLE handle, int oflag);
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#endif
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